Stochastic Study Of 60-mm
Gun-projectile Responses
Author(s)
M. Chen
Abstract
Gun propulsion modeling has been under development for many decades.
Starting from lumped parameter computer code, then 1D and 2D approaches and
finally by multi-dimensional and multi-phase interior ballistics codes, one has
been able to estimate in-bore pressure-time history at a fairly accurate level.
However, some underlying assumptions among the models exhibit certain levels
of uncertainties, for instance: the time-varying friction between obturator and
bore surface; the granular shape variations of propellant charges; the packaging
deviations of each propellant load, etc. This study was to investigate in-bore
responses of a 60-mm projectile subjected to the inherent randomness of
propulsion pressures. The pressure-time curve was modeled with 47 Gaussian
variables. A total of 100 pressure samples were then generated through Monte
Carlo simulation techniques. Subsequently, the time histories of the highest
in-bore velocity, peak acceleration and the maximum von Mises stress responses
of the projectile were obtained respectively corresponding to each pressure
simulation. The goals were to gain more understanding of how the projectile
performs in response to the changes of chamber pressures, and how much
variation of the responses should be expected from experimental results under
normal circumstances. The significance of the random variables on the projectile
responses was outlined as well.
Keywords: interior ballistics, 60-mm projectile, IBHVG2, Monte Carlo
simulation, stochastic responses.
1 Introduction
The modeling of complex gun propulsion schemes has evolved at a great stride
over the past two decades. In the mid 1980s, a lumped-parameter computer code
IBHVG2 (Interior Ballistics of High Velocity Gun, version 2), developed by the
Keywords
interior ballistics, 60-mm projectile, IBHVG2, Monte Carlo
simulation, stochastic responses.
Related Book
Other papers in this volume
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